2007 Hyundai Getz engine wont start

hi there. Whats wrong with the hyundai getz wont start. All fuses in under hood and under dash panel are good. Main relay also was good. Fuel pump and ignition system not working. Check engine light wont comes out when the key is in ON position. And theres a niose in the idle air control valve when the key is ON sounds like there is a short circuit inside the valve. Is it defective computer box?Please help me. Thanks guys